Background

A naval militia in the United States is a reserve military organization administered under the authority of a state government. It is often composed of Navy, Marine Corps, and Coast Guard reservists, retirees and volunteers.
Naval militia are active in Alaska, New York, Ohio, South Carolina, Texas and Virginia, but authorized in most other coastal states.
Source: en.wikipedia.org/wiki/Naval_militia

Commodore

image by Miles Li, 9 February 2004

This broad pennant is no longer in use (white rank flags with blue stars, for naval flag officers with limited command, are now used). Image as shown in National Geographic Magazine 1917.Miles Li, 9 February 2004

Pennant

image by Miles Li, 9 February 2004

The pennant was shown on NGM as a triangular pennant, not swallow-tailed like other US commission pennants. Image as shown in National Geographic Magazine 1917.Miles Li, 9 February 2004